Honing machine



Jan. 30, 1934. A. M. JOHNSON l-,945,045

HONING MACHINE Filed Aug. 1o, 1951 s sheets-sheet 1 gk.. 2z

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Jan. 30, 1934.

A. M. JOHNSON 1,945,045

HONING MACHINE Filed Aug. 10, 1931 5 Sheets-Sheet 2 Jax). 30, 1934. A. M. JOHNSON HONING MACHINE Filed Aug. 10, 1951 5 Sheets-Sheet 3 fin- 4 H w fn.

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Ilnliff Blik Patented Jan. 30, 1934 HONING MACHINE Albert M. Johnson, Rockford, Ill., assignor to Barnes Drill Company, Rockford, Ill., a corporation of Illinois Application August 10, 1931.

30 Claims.

The present invention relates to a machine in which a given operation is performed repeatedly and at the end of a predetermined series of such operations an operation of a different character takes place, such, for example, as a machine for honing cylindrical surfaces such as engine cylinders, bearing bushings, etc., and is more especially directed to a control mechanism for such machines which after institution of the operation will 'i0 cause the tool or tools to travel from an inoperative position to an operative position, then to reciprocate a predetermined number of times in the operative position, then to return to the inoperative position, and finally to stop automatically in the inoperative position. In a copending application Serial No. 389,116, led August 29, 1929,

by Albert M. Johnson and Walterv M. Fairbairn,

a mechanism designed to accomplish the foregoing control is disclosed and claimed. The present invention constitutes an improvement upon the prior mechanism of said copending application.

The primary object of the present invention is to provide a novel control mechanism of the character indicated, which renders it possible to control more easily and conveniently, the number of operations which shall take vplace upon a given piece of Work, and which is otherwise of a practical character.

Another object is to provide such a control mechanism including a stroke-counting device of such character that any desired number of operations may be provided for without limitation by the nature of the counting mechanism.

A further object is to provide a control means of the above character including, in combination with a reversing mechanism determining the direction of the movement of the tool, a dial counter, together with power actuated means controlled by the counter and acting upon the reversing mechanism to effect the desired number of strokes.

Another object is to render possible the deter.- minati on of the number of strokes by the operator, independently of the stroke counting mechanism, so that when desired the number of strokes may be increased or decreased selectively as conditions may dictate.

Still another object is to provide a control mechanism adapted for electromagnetic actuation, either under the control of the stroke counter or manually as desired.

A further object is to provide means of an advantageous character for automatically resetting the counter and conditioning the control mechanism for the succeeding operation.

"work supporting table 11.

Serial No. 556,089

Yet a further object is to provide a control mechanism operable automatically under the control of a counting device to obtain a cycle of operation of predetermined length, or manually operable to obtain a cycle of less or greater length, together with means operating automatically to restore the counting device to initial position upon the termination of each cycle regardless of the length thereof.

In the accompanying drawings, wherein I have illustrated a preferred embodiment of the invention,

Figure 1 is a perspective view partially fragmentary in character illustrating a honing machine with a control mechanism constructed in accordance with my invention.

Figs. 1a, 1b, and 1c are fragmentary detail views of parts shown generally in Fig. 1.

Fig. 2 is a fragmentary side elevational View looking from the left in Fig. 1.

Fig. 3 is a schematic view illustrating the dial counter in perspective, a portion of the casing being broken away, and further showing the electromagnetic actuating means for the reversing mechanism.

Fig. 4 is a fragmentary plan section of the structure shown in Fig. 2.

Fig. 5 is a fragmentary plan section illustrating the electromagnetic actuation of the reversing mechanism.

Fig. 6 is a side elevation illustrating a detail of construction.

The control mechanism may be incorporated in various types of honing machines. In each instance. the mechanism is adapted to be actuated by the main reciprocable member, usually the tool support, and to act upon a valve element or a clutch element, depending on whether the machine is driven hydraulically or mechanically, controlling the drive for the member. For purposes of illustration, the control mechanism is shown in connection with an hydraulically operated honing machine of the same general type as that disclosed in my prior Patent No. 1,783,019 dated November 25, 1930.

Referring now to the drawings, the machine to which my invention in its present embodiment is applied, comprises an upright column 10 carrying at its lower forward side a normally stationary At the upperend of the column 10 is mounted a gear box 12 which, as in the case Vof said prior patent, contains a conventional clutch-controlled drive mechanism (not shown) for' driving a vertically disposed spindle 13 having a splined connection with said drive mechanism and passing upwardly through an overhanging portion 14 of the gear box. Power for driving the spindle 13 is derived from an electric motor 15 mounted rearwardly of the upper end of the column and connected in any suitable manner with the clutch-controlled drive mechanism. 16 designates a crank connection between the clutch mechanism and the upper end of a control rod 17 forming part of an operator for controlling the spindle driving mechanism.

The spindle 13 extends downwardly from the overhanging portion 14 of the gear box through a sleeve 18 xed at its lower end to a tool supporting head 19. The sleeve 18 is guided for vertical sliding movement in a forward extension 20 rigid with the column, and the head 19 is guided for vertical reciprocation on the column by means of a pair of guide rods 21. The upper ends of said rods are rigidly secured to the column by means of brackets 22 (one only being shown) and the lower ends of said rods are rigid with a bracket 22 secured to the front face of the cover.

Into the head 19 extends the lower end of the spindle 13 for operative connection with one or more tool supporting spindles 23. Herein two such spindles are shown. They may be driven from the spindle by means generally similar to that disclosed in my said prior patent. The lower ends of the two spindles 23 carry honing tools 24 adapted in the downward movement of the head to enter guide sleeves 25 mounted in the bracket 22, such sleeves serving to guide the honing tool to the work indicated at 26, which is mounted on the table beneath the bracket 22.

In the embodiment illustrated, hydraulically actuated mechanism is employed for the purpose of reciprocating the tool head 19. This mechanism, while forming per se no part of the present invention, comprises in the present instance a cylinder 27 mounted upon the upper end of a standard 28 which in turn is connected to the upper end of the column. The spindle 13 extends upwardly into the standard 28 for operative connection with a piston rod 29 depending from the cylinder 27, the piston itself not being shown.

The upper and lower ends of the cylinder 27 are connected respectively by pipe connections 30 and 31 with an hydraulic circulating system of a type well known in the art and forming per se no part of this invention. Of this system, 32 designates the main control valve, suitably connected with the pressure and suction sides of a pump which, in the present instance, is housed within the column, The valve 32 operates to direct pressure alternately into the pipe connections 30 and 31 to cause continuous reciprocation of the actuating piston. Said .valve 32 is in turn controlled by a pilot valve 33, suitably interconnected therewith and also controlled with the pump. 34 is a stop valve adapted when closed to cut oi the supply of pressure iluid to the control valve 32. v The pilot valve 33 is arranged to be operated as an incident in the reciprocation of the tool supporting head 19 so as to cause the latter to be reciprocated continuously when the stop valve 34 is open. The means employed in the present instance for operating the pilot valve 33 is of the skip stop type, generally similar to that employed in said copending applicaton Serial No. 389,116. It comprises a control rod 35 mounted at one side of the standard 28 for rocking movement on a vertical axis and also for limited axial movement, a suitable counter-balancing spring 35a being provided to sustain the weight of the rod and the parts attached thereto.

The rod 35 is yieldably held in a predetermined position by means of spring pressed plungers 36 acting upon a single plate 37 fast on the rod 35 (see Fig. la), the rod having a slidable but nonrotatable connection with the plate. The lower end of the rod carries a handle 38 whereby it may be rotated at will against the action of the plungers 36.

Adjustably mounted on the rod 35 in vertically spaced relation is a plurality of members in the form of upper and lower stop disks 39 and 40 and an intermediate dog 41. These stop members are arranged for coaction with an arm 42 iixed to the piston rod 29 and projecting through one side of the standard 28. Normally, that is to say, during the operation of the machine upon a given piece of work, the arm 42 is positioned between the lower stop disk 40 and the dog 41, and it will be apparent that as the piston rod moves in opposite directions the arm 42 will alternately engage the lower limit stop 40 and the dog 41 and thus reciprocate the rod 35. Such movement of the rod 35 is utilized to actuate the pilot valve 33 which, it will be remembered, controls the ow of pressure uid to the opposite ends of the cylinder 27.

The means whereby the pilot valve 33 is operated by the rod 35 is generally similar to that disclosed in said copending application. It comprises (Figs. 2 and 4) a bar 43 mounted for vertical reciprocation in a housing 44 and having a stud 45 horizontally grooved to receive the flange of a collar 46 fast 'on the rod 35. Slidable in the housing 44 transversely of the bar 43 is a bar 47 connected by a link 48 with a valve rod 49 of the pilot valve 33. The bar 47 carries a roller 50 which operates in a cam groove 51 formed in the vertically movable bar 43. A spring 52 mounted in a forward extension 53 of the housing and adjusted by a screw 54, bears at its inner end against a bearing member 55 frictionally engaging with the bar 47 so as to hold the pilot valve against accidental movement. It will be understood that the cam groove 51 is so shaped that in the vertical reciprocation of the control rod 35, an endwise horizontal movement is imparted to the bar 47 in a direction to cause reciprocation of the spindle 13.

At the end of the operation upon a given piece of work, the honing tools are withdrawn therefrom by operating the control rod 35 so as to carry the intermediate dog 41 into a position such that it will clear the arm 42 on the piston rod when the latter moves upwardly. In such event, the piston continues its upward travel until the arm 42 strikes the limit stop 39, whereupon the rod 35 is elevated and, through its cam connection with the pilot valve 33, the direction of movement of the piston is reversed. Thereupon the actuating means is stopped by the operation of the stop valve 34 through the medium of a crank 56 (Fig. l) mounted on a rotatably mounted sleeve 57 and connected by means of a link 58 with the valve rod of the main stop valve 34. The sleeve 57 is mounted on the lower end of the operating rod 17 of the clutch controlled drive mechanism, and carries a handle 59 whereby the sleeve may be operated.

The handle 59 carries a latch 60 adapted for connection with a handle 61 on the lower end of the rod 17, so that when desired both the rod and the sleeve may be operated in unison. Normally when the machine is in operation, the two handles 59 and 61 are connected by the lll) for the spindle but also the hydraulic actuating means.

In initiating the succeeding operation, the stop valve 34 is operated, and the piston rod 29 descends into its normal working position between the lower stop member 40 andthe intermediate dog 41. In order that the arm 42 may thus move downward beyond the dog 41 without necessitating the rotation of the rod 35, the dog is constructed, as shown in Fig. 1b, so as to yield when engaged bythe arm in the downward movement of the latter. Thus the dog is in the form of a yoke pivotally mounted upon a block 62 carried by the rod 35, being spring pressed outwardly into engagement with the block and thereby adapted to be engaged by the arm 42 in the normal upward movement of the spindle head but adapted to yield in the downward movement of the arm.

The means which I have provided in the present instance for automatically limiting the number of reciprocations of the head 19 while in its operative position, and thereafter causing withdrawal of the head to its inoperative position, comprises, generally stated, a dial counter 63 operatively associated with the control rod 35 so as to be actuated thereby once for each reciprocation of the tool supporting head 19, and power actuated means operable upon the accumulation of a predetermined number of strokes by the counter 63 to rock the shaft 35 and thereby carry the intermediate dog 41 out of the path of the upwardly moving arm 42. Moreover, means is provided which is operable in the movement of the head 19 toward its uppermost position to reset the counting device, and to render said power-actuated means inoperative and thus vpermit restoration of the control rod to its normal position.

The counting device 63 isof the so called dial or disk type, being of well known construction and having an actuating element in the forni of a shaft 64 (Fig. 3), a resetting element in the form of a shaft 65, and a switch 66 which is arranged to be closed or opened by a cam 66 after a predetermined number of operations of the actuating element 64. The counting mechanism is of such character that it is capable of being set easily and conveniently for the purpose of causing closure of the switch 66 after any predetermined number of operations. Moreover, the number of reciprocations which may be accumulated by the counter is not limited by the construction employed as is the case with a ratchet mechanism of the type disclosed in said copending application. Characteristic of the dial or disk type of counter is the construction enabling resetting thereof by the same predetermined movement of the resetting element regardless of the number of operations of the actuating element 64. In the counter here employed such resetting is effected by a single revolution of the shaft 65.

Closure of the switch 66 upon the accumulation of a predetermined number of strokes is utilized in the present instance to operate the control rod 35 through the medium of a power actuated means in the form of an electromagnet 67 having an armature 68 connected by a link 69 with a crank arm '70 fast on the rod 35. The magnet 6'7 is energized from a suitable source of current upon the closure of the switch 66 through the medium of a switch '71 arranged to be actuated by a small magnet '72 normally under the control of the switch 66.

Actuation of the counter 63 through the actuating shaft 64 is effected in the present instance by means of a cam 73 and an arm '74 fast on the shaft 64. The end of said arm 74 is normally held in the path of movement of the cam '73, which latter is mounted on an arm '75 (Fig. 2) loose on the rod 35 and extending through a slot '75a in the supporting bracket for the counter. It will be seen that in the reciprocation of the rod 35, eiected by the arm 42 and the stop members on said rod 35, the cam 73 will be moved into engagement with the arm '74 once for each reciprocation of the tool-supporting head 19 when the latter is in operative position with the honing tools engaging the work.

Upon the accumulation of a predetermined number of strokes by the counter, the switch 66 is closed, causing the magnet 6'7 to be energized and the control rod 35 rocked in a direction to carry the intermediate dog 4l out of the path of movement of the arm 42 rigid with the piston rod. As a result, the tools are withdrawn from the work to an extent determined kby the position of the upper stop member 39, the latter operating to actuate the pilot valve 33 and thereby conditioning the machine for the next operation.

When the tool supporting head has thus been Withdrawn from the work, the machine is stopped automatically in a manner which will presently be described, and as an incident to such withdrawal of the tools, the counter 63 is reset and the switch 66 opened so as to deenergize the magnet 6'7 and thus permit the control rod 35 to be restored to its normal position by the spring plungers 36 (Fig. 6) before the arm 42 reaches the stop 39. Such resetting of the counter takes advantage of the characteristic resetting movement and is accomplished in the present instance by means of a rod 76 slidably mounted for vertical reciprocation at one side of the spindle sleeve 18 (Fig. 1). The lower end of the rod is adapted to abut an adjustable stop screw '7'7 carried by the head 19 and the upper end of the rod is provided with a toothed rack 78 which is adapted to mesh with a pinion '79 fast on the resetting shaft 65 of the counter.

When the tool head 19 is in its lower or operating position, with the honing tools in engagement with the work, the rack engages with the pinion 79, and in the upward movement of the head to withdraw the tools from the work, the stop screw 77 engages the rod '76 and the pinion is actuated to reset the counter and open the switch 66 after the arm 42 has passed the stop 41 but before the arm reaches the stop 39. Below the rack '78, the rod '76 is cut away so that after the counter has been reset the rod may continue its upward movement to the position shown in Fig. 1.

In order that the setting of the counter may be effected only in the movement of the rod '76 in one direction, the resetting mechanism proper It is sometimes desirable to vary the number of strokes' without changing the setting of the counter, and I have provided an arrangement whereby the number of strokes'which may occur may be increased or decreased as desired by operating one of two switches and 81 manually. The switch 80 is normally closed, and is in series with the counter switch 66. It will therefore be evident that by operating the switch 80 to open position, the counter switch is rendered ineffective to close the circuit to the switch magnet 72. The reciprocations o1 the head thus continue so long as the switch 80 is held open. When the switch is permitted to close, the switch 66 previously closed becomes eliective to cause energizationof the magnet 67. It will be observed in this connection that the cam 66B for closing the switch is adapted to remain effective for a substantial number of reciprocations in excess of the number set in the counter.

The switch 81 is normally open and is connected in parallel with the counter switch 66, so that when a smaller number of strokes is desired than the number set on the counter, closure of this switch 81 will energize the switch magnet 72 so as to cause the magnet 67 to operate the control rod 35, thereby permitting the tool supporting head to move upward'y and withdraw the tools from the work. It is to be noted that should any condition arise during the operation on a given piece rendering withdrawal of the tools from the work piece necessary or desirable, the operator can effect such withdrawal quickly and conveniently by simply closing the switch 81. Thus the switch serves both as a manual control for varying the number of strokes and as an emergency stop.

'I'he means for automatically interrupting the spindle driving mechanism and the hydraulic actuating means when the spindle head is withdrawn from the work after a honing operation and reaches the normal upper limit position determined by the stop 39, comprises a cam plate 82 carried by the sleeve 57 and adapted to be engaged by a roller 83 mounted on the tool supporting head 19, the arrangement being such that when the tool head is withdrawn upwardly to the proper extent, the sleeve 57 is operated to close the stop valve 34 and thereby render the pilot valve 33 ineffectual in causing reversal of the spindle head when the arm 42 engages the stop 39. Also the operating rod 17 of the spindle drive mechanism is simultaneously operated through its connection by the latch 60 with the handle 59 on the sleeve 57.

The cam plate 82 is, in the present instance, mounted on the free end of an arm having two parts 84 and 85, both pivoted on a rod 86 disposed parallel to the rod 17. The part 85 is mounted on the lower end of the sleeve 57 and is rigidly connected to the part 84 by means of a spring pressed plunger 87. The upper end of the rod 86 is adjustably mounted in a bracket arm 88 fixed on the rod 17. By this arrangement, the cam plate 82 may, by operation of the locking plunger 87, be swung on the axis ofthe rod 86 independently of the part 85 into an inoperative position with respect to the roler 83. Normally, however, the parts 84 and 85 of the arm carrying the plate are rigidly connected together, and when the roller engages with the plate, the arm, together with the rod 86 and the bracket arm 88, swing as a frame on the axis of the control rod 17 to interrupt the driving mechanisms.

In order to raise the spindle head above the normal upper limit position for the purpose of replacing the honing tools 24, the stop 39 is made in the form of a lug 39a which, when the control rod 35 held oscillated out of normal position as may be done by manipulation of the handle 89, permits the arm 42 to pass the stop 39 in the upward travel of the spindle head. The movement is then interrupted by engagement of the arm 42 with a stop 90 on the shaft 35 which engagement occurs after the tools 24 have been fully withdrawn from the guide bushings 25. To permit such additional upward movement of the spindle head, it is of course necessary to swing the cam plate 82 out of the path of the roller 83 and to manipulate the stop valve 34 by hand in order to avoid reversal of the spindle head when the stop 90 is engaged. After replacement of the tools, the spindle head may be lowered by hand manipulation of the stop valve 34 While the control rod 35 is maintained in oscillated position to allow the arm 42 to pass the lug 39a.

The operation of the machine may now be summarized:

Assuming the parts to be in the position shown in Fig. 1, with thetool-suppox'ting head withdrawn to its normal upper position out of the work, the handle 59 is operated after disengaging the latch 60, so as to rotate the sleeve 57 and open the stop valve 34. Pressure fluid is now admitted to the cylinder 27 to move the head downwardly, and in such movement, the arm 42 carried by the piston rod 29 moves downwardly past the dog 41, the latter yielding for this purpose. Preferably the handle 59 is operated reversely to stop the downward descent of the honing tools after the latter have entered the work. The

.latch 60 thus becomes reengaged and subsequent operation of the handle 59 will cause the stop valve to be opened and the rod -17 of the clutch driving mechanism simultaneously operated to start the rotation of the tool spindles.

Upon the completion of the downward movement, the lower limit stop 40 will be engaged by the arm 42 and the pilot valve 33 operated to reverse the direction of movement of the head, such operation of the valve being effected by the cam connection between the control rod 35 and the pilot valve. Similarly,` the dog 4l is next engaged by the arm 42 to reverse the pilot valve and start the head downwardly.

For each complete normal reciprocation of the head, the actuating element of the stroke counter 63 is operated, and upon the accumulation of the predetermined number of strokes, the switch 66 (Fig. 3) is closed so as to energize the switch magnet 72 and thereby the main magnet 67, the latter operating to Arock the control rod 35. Such movement of the control rod moves the intermediate dog 41 out of the path of movement of the arm 42 and the head travels upwardly to withdraw the honing tools from the work.

In such upward movement of the tool head, the resetting rod 76 is engaged by the head and the resetting pinion 79, meshing with the toothed rack on the rod, operates the resetting shaft 65 of the counter. When this occurs, the switch 66 is opened, thus effecting the deenergization of Ithe magnet 67 and permitting the control rod 35 to be restored to its normal position by its controlling springs.

As the head approaches its upper limit of travel, the arm 42 engages the upper limit stop 39 on the control valve so as to reverse the pilot valve 33 and thus prepare the parts for the next downward movement fof the head. The hydraulic actuating mechanism and the spindle `"drive mechanism are interrupted in their operations approximately simultaneously with the engagement of the arm 42 with the upper limit stop 39, by the action of the cam plate 82 and roller 83, thus bringing the parts to rest in the position shown in Fig. 1. i

When it is desired to increase the number of reciprocations beyond that set in the counter, the push button of switch is operated to open the circuit controlled by the switch 66, thereby rendering the latter ineffective to cause energization of the magnet 67. When the desired excess number of reciprocations has occurred, the switch 80 is permitted to close, and the previously closed switch 66 causes energization of the magnet 67 to initiate withdrawal of the head 19.

When the number of operations desired is less than that set in the counter, the switch 81 is operated to close the circuit controlling the magnet 67 in advance of the closure of the switch 66 by the counter. When this occurs, the magnet 67 becomes energized and the control rod operated to effect withdrawal of the head and the resetting rod 'Z6 is operated to restore the counter to its initial position.

I claim as my invention:

1. In a machine of the character described, the combination with a reciprocable support and actuating means therefor, of a control mechanism of the skip stop type including a device rotatably and slidably supported, a member fixed to the movable support and operatively associated with said device to move it, said device having a normal position in which it is operative to effect continuous reciprocation of the support through a normal range of movement, means operable when a predetermined number of reciprocations has occurred to rotate said device out of said normal position, and means operative as an incident to the last mentioned movement of said device to interrupt the reciprocation of the support.

2. I n a machine of the character described, the

combination of a reciprocable support, actuating means therefor including a reversingmechanism having a control element operable in one position to eiect reciprocation of the support Vthrough a normal range of travel and in another position to eiect movement beyond such normal range of travel, a counting device responsive to the number of reciprocations of the support through its normal range of travel, electromagnetic means controlled by said device upon the accumulation thereby of a predetermined number of reciprocations to move said control element into its abnormal position, means operable as an incident to the abnormal movement of the support to stop the movement thereof, said electromagnetic means including a magnet for actuating said control element, and manually operable switch means operative to control said magnet whereby to vary the number of said normal reciprocations in either direction from the predetermined number.

3. In a honing machine the combination of a support, means for reciprocating the support including a reversing mechanism operative to effect a continuous reciprocation of the support through a normal predetermined range of travel, electromagnetically actuated means operable automatically when the number of reciprocations reaches a predetermined maximum to condition said reversing mechanism so as to permit movement of the support beyond its normal range of travel, means for stopping the support during such abnormal travel thereof, said electromagnetic means including a magnet for actuating said control element, and manually operable switch means operative to control said magnet whereby tovary the number of said normal reciprocations.

4. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, a counter responsive to said reciprocations, an electrically actuated device operatively associated With sai-d reversing mechanism and adapted to condition the same to permit movement of said member beyond said normal range of travel, and means controlling the energization of said device including two switches connected in series, one having a normal closed position, and the other having a normal open position and adapted to be closed by said counter.

5. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to eiect reciprocation of said member through a normal range of travel, a counter responsive to said reciprocations, an electromagnet operatively associated with said reversing mechanism and adapted to condition the same to permit movement of said member beyond said normal range of travel, and means controlling the energization of said magnet including two normally open switches connected in parallel, one adapted for manual operation no and the other operable by said counter.

6. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, a counter responsive to said reciprotions, an electrically actuated device operatively associated with said reversing mechanism and adapted to condition the same to permit movement of said member-beyond said normal range of travel, and means controlling the energization of said device including a switch adapted to be closed by said counter and a pair of manually operable switches, one normally closed and in series with said counter switch, and the other normally open and connected in parallel with said counter switch.

7. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to eiTect reciprocation of said member through a normal range of member beyond said normal range of travel, and

means operable by said member as an incident to such abnormal movement thereof to actuate said resetting element.

8. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, a dial counter having an actuating element operatively associated with said member and a resetting element, means controlled by said counter for permitting movement of said member beyond said normal range of travel, and means operable by said member as an incident to such abnormal movement thereof to actuate said resetting element, the means controlled by be opened by said resetting element.

9. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to eiect reciprocation of said member through a normal range of travel, a dial counter responsive to said reciprocations of said member, electromagnetic means controlled by said counter and including an electromagnet-operable to condition said reversing mechanism to interrupt the number of normal reciprocations of the member, means controlling the energization of said magnet including a switch adapted to be closed by said counter, and a device associated with said member and operable to reset the counter and to open said switch as an incident to the movement of the member beyond said normal range of travel.

10. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, a dial counter having an actuating element operatively associated with said member and a resetting element, means controlled by said counter for permitting movement of said member beyond said normal range of travel, said resetting element including a pinion, and means including a rod movable by said member as an incident to its abnormal movement to actuate said pinion, said rod having a rack meshing with said pinion through a limited portion only of the movement of the rod by said member.

11. In a machine of the character described, the combination of a reciprocable support, actuating means therefor including a reversing mechanism having a control element operable in one position to effect reciprocation of the support through a normal range of travel and in another position to eect movement beyond such normal range of travel, a dial counter having an actuating element, said control element being mounted for reciprocation as an incident to the reciprocation of said support, a cam carried by said control element and movable into engagement with the actuating element of the counter once for each reciprocation of the support, and means controlled by the counter and operable upon the accumulation thereby of a predetermined number of reciprocations to move said control element into its abnormal position.

12. In a machine adapted to perform a given operation repeatedly, a dial counter arranged to be advanced step by step as an incident to such repeated operations and having rotary resetting mechanism associated therewith, a control means operated as an incident to the registration of a predetermined number of operations by said counter, and a power driven device independent of said counter caused to be actuated by the operation of said control means and functioning during such actuation to reset said counter through said resetting mechanism.

13. In a machine, the combination of a reciprocable member, a dial counter having an actuating element operatively associated with said member and adapted to register the reciprocations thereof, a rotary resetting element associated with said counter and operable upon a given rotation to restore said counter to zero regardless of the number of reciprocations registered, and means operable automatically upon the registration of a predetermined number of reciprocations to effect such rotation of said resetting element by said reciprocable member.

. 1,945,045 ,said counter including a switch also arranged to 14. In a machine of the character set forth having a tool and a piece of work arranged for relative reciprocation, actuating means having a main control mechanism initially operable to associate the tool and the work and then to cause a plurality oi' working reciprocations between the work and tool, an auxiliary control device including a dial counter advanced in response to successive working reciprocations and operable at the end oi' a predetermined number of such reciprocations to actuate said main control mechanism whereby to disassociate the tool and work, and mechanism actuated by said tool during the association and disassociation of said tool with the work piece and operative in the disassociation to reset said dial counter and inoperative to effect any change in the setting of the counter in\ the association.

115. In a machine of the character set forth having a tool and a piece of work arranged for relative reciprocation, actuating means having a main control mechanism initially operable to associate the tool and the work and then to cause a plurality of working reciprocations between the work and tool, an auxiliary control device including a dial counter advanced in response to successive working reciprocations and operable at the end of a predetermined number of such reciprocations to actuate said main control mechanism whereby to disassociate the tool and work, a member operable upon a given rotation to restore said counter to zero, and means having a one-way driving connection with said member and operable upon each disassociation of the tool and work to impart the given rotation to said member.

16. In a power driven machine adapted to perform a given operation repeatedly, a counter having a plurality of dials arranged to-be advanced step by step in response to the operations of the machine, a control means operated as an incident to the movement of the dials into a relation predetermined by the setting of said counter, a member operable upon movement through a predetermined distance to restore said dials to zero position, a device caused to be moved through predetermined distances in opposite directions by the operation of said control means, and a one-way driving connection between said device and said member for actuating said member in one direction only.

17. A machine of the character set forth, having in combination, a work support and a tool support arranged for relative movement to position the work and tool in operative association, means including a control device operative to withdraw one of the supports to disassociate the tool and the work, means operative automatically upon the completion of an operating cycle of predetermined duration to actuate said control device to render .said withdrawing means effective, and manual means for governing the operation of said control device either to increase or to decrease the duration of the operating cycle relative to said predetermined cycle.

18. In a honing machine, the combination oi a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, a counting device responsive to said reciprocation, means controlled by said device for automatically limiting the number of said normal reciprocations, and means for manually controlling thc number of said normal reciprocations operable at will either to 4interrupt normal reciprocation prior to the limit maintained by said counting device or to delay interruption by said counting device until the limit has been exceeded by a desired number of reciprocations.

19. In a honing machine, the combination of a reciprocable member, means including a reversing mechanism operative to effect reciprocation of said member through a normal range of travel, means operative to interrupt normal reciprocation of said member, a counting device responsive to said reciprocation and controlling said last mentioned means to interrupt automatically said normal reciprocation after a predetermined number of reciprocations, and manual means operative to supersede control by said automatic means and operative to obtain any desired number of normal reciprocations.

20. A machine of the character set forth, having in combination, a Work support and a tool support arranged for relative movement to position the work and tool in operative association, means including a control device operative automatically to withdraw one of the supports to disassociate the tool and the work after a predetermined operating cycle, an electric control circuit for said device conditioned automatically upon the completion of said operating cycle and normally operative to initiate the actuation of the control device, and manual means operable selectively either to initiate operation of said device prior to the automatic conditioning of said circuit or to ren-der said circuit temporarily inoperative when automatically conditioned upon the completion of the predetermined cycle.

21. A machine of the character set forth, having in combination, a work support and a tool support arranged for relative movement to position the work and tool in operative association,`

means including a control device operative automatically to withdraw one of the supports to disassociate the tool and the work after a predetermined operating cycle, an electric control circuit for said device having a switch therein conditioned automatically upon the completion of said operating cycle and normally operative to initiate the actuation of the control device, and manually operable means for initiating the operation of said device independently of said switch to decrease the duration of said cycle, said manual means being further operative to render said switch temporarily ineffective so as to increase the duration of said cycle.

22. A machine of vthe character set forth, having in combination, a work support and a tool support arranged to position the work and tool in operative association, means operative to withdraw one of the supports to disassociate the tool and the Work including a control device, means operative automatically upon the completion of a predetermined number of operations to actuate said control device to render said Withdrawing means eiective, and manual means for governing the operation of said control device to increase the number of operations above said predetermined number, said manual means being operative selectively vto render the control device eifective to vary the number of operations above said predetermined number.

23. In a machine of the character described, the combination of a support, means for reciprocating the support, means including a device for counting the reciprocations of the support and normally operable to stop the support when a predetermined number of reciprocations has occurred, and manually operable means for delaying the operation of the last mentioned means until after the occurrence of any desired additional number of reciprocations.

24. In a honing machine, the combination of a support and driving means therefor, mechanism operative to eiect continuous reciprocation of said support through a normal range of travel, means operable upon said mechanism to interrupt the normal reciprocation of the support, automatic means including a counting device responsive to such reciprocations and through said last mentioned means acting to interrupt the normal reciprocation of the support upon the occurrence `of a predetermined number of reciprocations,Y

and manual means operable to prevent interruption by said automatic means upon the occurrence of the predetermined number of reciprocations and thereafter controlling the time of interruption. l

25. In a machine of the character described, the combination of a support, means for reciprocating the support including a mechanism operative to eiect continuous reciprocation through a normal predetermined range of travel, means operable upon said mechanism to interrupt the 1 normal reciprocation of the support, a counting device responsive to each of such reciprocations and operable through said means to interrupt the normal reciprocation after a predetermined number thereof, and manual means rendering 1 said counting device ineffective to interrupt the normal reciprocation at the predetermined number but eiective at an additional number of reciprocations less than the predetermined number.

26. A machine of the character set forth, havl ing in combination, a work support and a tool support arranged for relative movement to position the work and tool in operative association, means including a control device operative automatically to withdraw one of the supports to dis- 21e l associate the tool and the work after a predemined operating cycle, an electric control circuit for said device conditioned automatically upon the completion of said operating cycle and normally operative to initiate the actuation of the i control device, and manually operable means for initiating the operation of said device independently of said conditioned circuit.

27. A machine of the character set forth, having in combination, a work support and a tool l support arranged for relative movement to position the work and tool in operative association, means including a control device operative automatically to withdraw one of the supports to disassociate the tool and the work after a predetermined operating cycle, an electric control circuit for said device having a switch therein conditioned automatically upon the completion of said operating cycle and normally operative to lli) initiate the actuation of the control device, and 'a manually operable means for rendering said switch temporarily ineffective to initiate the operation of the control device whereby to increase the duration of said operating cycle.

28. In a machine of the character described, t

the combination of a reciprocable support and actuating means therefor, mechanism causing reciprocation of the support through a normal range of travel, a counting device responsive to such reciprocations and operable automatically upon the occurrence of a predetermined number of reciprocations to cause said mechanism to interrupt normal reciprocation, manual means arranged to be substituted for automatic control by said counting device and operable to obtain any l desired number of reciprocations greater or less than the predetermined number, and means operable to restore said counting device to initial position upon interruption of reciprocation regardless of the number of reciprocations which has occurred.

29. In 'a machine of the character described, the combination of a reciprocable support and actuating means therefor, a control mechanism causing reciprocation of -the support through a normal limited range of travel, said control mechanism being operable to permit an abnormal movement of the support beyond the limited range, a counting device responsive to each of such normal reciprocations and operative through said control mechanism to eiect an abnormal movement of the support upon the occurrence of a predetermined number of normal reciprocations, manual means superseding control by said counting device and operative to obtain any desired number of normal reciprocations greater or less than the predetermined number, and rotary means operated in the abnormal movement of the support to reset said counting device to initial tions, manual means operable to Withdraw control of said means from said counter and elect an abnormal movement at will, a rotary resetting element associated with said counter and operable upon a given movement ta restore the counl ter to initial position regardless of the number of reciprocations registered, and means operable by said support as an incident to the abnormal movement to impart the given movement to said resetting element. 1

ALBERT M. JOHNSON. 

